Fan and range hood

Abstract

The embodiment of the utility model provides a kind of fan and extractor hood, relate to kitchen electrical technology field.The utility model provides a kind of fan and extractor hood, by setting up in the air outlet pipe and set up drainage piece, and one end of drainage piece extends to near the connection of volute and air outlet pipe;So that when fan works, drainage piece can directly drain the vortex airflow generated at the connection of volute and air outlet pipe to the air outlet of air outlet pipe, to inhibit the expansion of low-speed vortex area in air outlet pipe, increase the effective flow area at air outlet, improve the air volume of extractor hood.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, specifically to a fan and a range hood. Background Technology

[0002] In related technologies, the centrifugal fan of a range hood is the core component of a kitchen exhaust system. The centrifugal fan has a fan casing and an exhaust duct located at the outlet of the fan casing. One end of the exhaust duct has a rectangular pipe interface connected to the rectangular outlet of the fan casing, and the other end has an arc-shaped pipe interface connected to the exhaust duct.

[0003] Because the exhaust duct is used for a transition from square to round, a large area of ​​low-speed vortex is generated when the airflow passes through the exhaust duct. This low-speed vortex blocks the outlet of the fan casing, reducing the effective flow area of ​​the outlet. As a result, the air volume of the range hood cannot be further increased, affecting the smoke extraction effect. Utility Model Content

[0004] The purpose of this invention is to provide a fan and a range hood that can suppress the expansion of the low-speed vortex area and improve the air volume of the range hood.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, the present invention provides a fan, including a volute and an impeller disposed inside the volute. The volute is connected to an air outlet pipe, the air outlet pipe is provided with an air outlet, and a guide member is provided at the air outlet. One end of the guide member extends to a point near the connection between the volute and the air outlet pipe.

[0007] When the fan is working, a vortex airflow is generated at the connection between the volute and the air outlet pipe, and the guide component is used to guide the vortex airflow.

[0008] In an optional embodiment, the flow guide is a flow guide pipe with a lower oblique cut, the oblique cut of which faces the low-speed vortex region at the connection between the volute and the air outlet pipe.

[0009] In an optional embodiment, the flow guide is a flow guide tube, which has an upper oblique cut, the oblique cut surface of which faces the high-speed airflow area at the connection between the volute and the air outlet pipe.

[0010] In an optional embodiment, the drainage element is a drainage tube, which includes at least a straight tube structure with a circular outer wall or a straight tube structure with an arc-shaped outer wall.

[0011] In an optional embodiment, the flow guide is a flow guide tube, which has a second channel penetrating through it. The second channel guides the vortex airflow. The lower end of the flow guide tube has a first inlet communicating with the second channel, and the upper end of the flow guide tube has a first outlet communicating with the second channel.

[0012] In an optional embodiment, the drainage element is rotatably configured relative to the first direction.

[0013] In an optional embodiment, the fan further includes a drive assembly connected to the air outlet pipe, the output end of the drive assembly being connected to the diverting member in a transmission connection, and the drive assembly being used to drive the diverting member to rotate relative to the first direction.

[0014] In an optional embodiment, the drive assembly includes a connecting part, a transmission assembly, and a drive member; the guide member is connected to the connecting part along a second direction, both ends of the connecting part are rotatably connected to the air outlet pipe, and one end of the connecting part passes through the air outlet pipe and is drively connected to the transmission assembly; the drive member is connected to the outer wall of the guide member, and the output end of the drive member is drively connected to the transmission assembly.

[0015] The driving component is used to drive the connecting part to rotate through the transmission assembly, so that the draining component rotates relative to the first direction;

[0016] The first direction and the second direction are perpendicular to each other.

[0017] In an optional embodiment, the transmission assembly includes a first transmission wheel, a transmission belt, and a second transmission wheel. The first transmission wheel is fixed to one end of the connecting portion, the output end of the driving member is connected to the second transmission wheel, and the transmission belt is sleeved on the first transmission wheel and the second transmission wheel.

[0018] Secondly, this utility model provides a range hood, including the fan described in any of the foregoing embodiments.

[0019] The beneficial effects of the fan and range hood provided in this embodiment of the utility model include:

[0020] By installing a flow guide in the air outlet duct, with one end of the flow guide extending to the connection point between the volute and the air outlet duct, the flow guide can directly guide the vortex airflow generated at the connection point between the volute and the air outlet duct to the air outlet of the air outlet duct when the fan is working. This suppresses the expansion of the low-speed vortex area in the air outlet duct, increases the effective flow area at the air outlet, and improves the air volume of the range hood. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the fan provided in this embodiment;

[0023] Figure 2 This is a schematic diagram showing the formation of a high-speed airflow zone and a low-speed vortex zone in the first channel of the air outlet duct, as provided in this embodiment.

[0024] Figure 3 This is a schematic diagram of the first structure of the fan provided in this embodiment;

[0025] Figure 4 This is a schematic diagram of the second structure of the fan provided in this embodiment;

[0026] Figure 5 This is a schematic diagram of the connection between the drainage component and the connecting part provided in this embodiment.

[0027] Icons: 010-Fan; Z-First direction; Y-Second direction; X-Third direction; 100-Outlet duct; 101-First channel; 102-Outlet; 103-High-speed airflow zone; 104-Low-speed vortex zone; 110-Base; 120-Body; 130-Connecting seat; 200-Drawer; 201-First inlet; 202-First outlet; 210-Lower oblique cut; 220-Upper oblique cut; 300-Drive assembly; 310-Connecting part; 320-Transmission assembly; 321-First transmission wheel; 322-Transmission belt; 323-Second transmission wheel; 330-Drive component; 331-Output shaft; 400-Vortex; 410-Spiral shell; 411-Second inlet; 420-Outlet; 430-Impeller. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0034] The following describes in detail the overall structure, working principle, and technical effects of the fan 010 and range hood provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0035] Please refer to Figure 2 The fan 010 provided by this utility model is used in range hoods.

[0036] The range hood proposed in this utility model includes a fan 010, a smoke collection hood, and a fan cover. The fan 010 is disposed inside the fan cover, and the fan cover is disposed on the top of the smoke collection hood along the first direction Z. The smoke collection hood is connected to the fan 010.

[0037] Please refer to Figures 1-4 The present invention also proposes a fan 010, including a volute 400 and an impeller 430 disposed in the volute 400. The volute 400 is connected to an air outlet pipe 100. The air outlet pipe 100 is provided with an air outlet 102. A guide 200 is provided at the air outlet 102. One end of the guide 200 extends to the connection between the volute 400 and the air outlet pipe 100.

[0038] When the fan 010 is working, a vortex airflow is generated at the connection between the volute 400 and the outlet pipe 100, and the guide component 200 is used to guide the vortex airflow.

[0039] Understandably, please refer to Figure 1 When the fan 010 is working, as the airflow passes through the outlet duct 100, part of the airflow passes at high speed at the connection between the volute 400 and the outlet duct 100, while another part of the airflow generates a large area of ​​low-speed vortex airflow at the connection between the volute 400 and the outlet duct 100. This vortex airflow blocks the airflow inside the volute 400 from entering the outlet duct 100, thus reducing the effective flow area at the outlet of the volute 400. Furthermore, after the high-speed airflow enters the outlet duct 100, it forms a high-speed airflow zone 103 within the outlet duct 100. At the same time, after the low-speed vortex airflow enters the outlet duct 100, it forms a low-speed vortex zone 104 within the outlet duct 100. This vortex airflow in the low-speed vortex zone 104 blocks the airflow from flowing out of the outlet 102, thus reducing the effective flow area of ​​the outlet 102. This makes it difficult to further increase the airflow of the range hood, affecting the smoke extraction effect.

[0040] Therefore, please refer to Figure 2 This application provides a guide element 200 inside the air outlet duct 100, with one end of the guide element 200 extending to the connection point between the volute 400 and the air outlet duct 100. This allows the guide element 200 to directly guide the vortex airflow generated at the connection point between the volute 400 and the air outlet duct 100 to the air outlet 102 of the air outlet duct 100 when the fan 010 is working. This suppresses the expansion of the low-speed vortex zone 104 area inside the air outlet duct 100, increases the effective flow area at the air outlet 102, and improves the air volume of the range hood.

[0041] In this embodiment, the fan 010 has a first direction Z, a second direction Y and a third direction X that are perpendicular to each other.

[0042] In this embodiment, the fan 010 includes an air outlet duct 100.

[0043] The air outlet duct 100 is provided with a first channel 101, an air inlet and an air outlet 102, and the two ends of the first channel 101 are connected to the air inlet and the air outlet 102 respectively.

[0044] In this embodiment, please refer to Figures 2-3The air outlet duct 100 includes an integrally formed base 110, a body 120, and a connecting seat 130. The base 110, body 120, and connecting seat 130 are arranged and connected sequentially from bottom to top along the first direction Z. The first channel 101 runs through the duct along the first direction Z. The base 110 is provided with an air inlet, and the connecting seat 130 is provided with an air outlet 102. The base 110 is a rectangular base and is used to connect with the volute 400. The body 120 is a rectangular shell structure. The connecting seat 130 is an arc-shaped connecting structure and is used to connect with an external exhaust duct.

[0045] In this embodiment, please refer to Figure 1 When the airflow in the volute 400 enters the outlet duct 100 from the inlet, the airflow passes through the first channel 101, and the airflow forms an adjacent high-speed airflow zone 103 and a low-speed vortex zone 104 in the first channel 101. The low-speed vortex zone 104 is located on the side closer to the spiral shell 410.

[0046] One part of the airflow passes through the high-speed airflow zone 103 at high speed, while the other part of the airflow generates a large area of ​​low-speed vortex in the low-speed vortex zone 104.

[0047] In this embodiment, the fan 010 includes a flow guide 200.

[0048] The diverting component 200 is disposed in the first channel 101 and at the air outlet 102, with one end of the diverting component 200 extending to the connection between the volute 400 and the air outlet 100. The diverting component 200 is used to divert the vortex airflow.

[0049] In this embodiment, the diversion element 200 is a diversion tube, which has a second channel that passes through it. The second channel diverts the vortex airflow. The lower end of the diversion tube has a first inlet 201 that communicates with the second channel, and the upper end of the diversion tube has a first outlet 202 that communicates with the second channel.

[0050] In this embodiment, please refer to Figure 2 and Figure 5 The drainage component 200 includes at least a straight tube structure with a circular outer wall or a straight tube structure with an arc-shaped outer wall.

[0051] Understandably, the circular or arc-shaped outer wall of the flow guide 200 can reduce gas flow turbulence, lower flow resistance, and improve flow efficiency.

[0052] Of course, in other embodiments, the drainage element 200 can also be a rectangular straight tube structure. This application does not limit the shape of the drainage element 200.

[0053] Alternatively, please refer to Figure 5 The drainage pipe has a lower oblique cut 210. The lower end of the drainage pipe is provided with the lower oblique cut 210. The oblique cut surface of the lower oblique cut 210 faces the low-speed vortex zone 104 at the connection between the volute 400 and the air outlet pipe 100.

[0054] Understandably, the lower oblique cut 210 is set at an angle relative to the horizontal line, which increases the area of ​​the first inlet 201, increases the contact area between the airflow and the low-speed vortex zone 104, accelerates the flow of air out of the low-speed vortex zone 104, and optimizes the diversion efficiency.

[0055] Alternatively, please refer to Figure 5 The drainage pipe has an upper oblique cut 220. The upper end of the drainage pipe is provided with an upper oblique cut 220. The oblique cut surface of the upper oblique cut 220 faces the high-speed airflow zone 103 at the connection between the volute 400 and the air outlet pipe 100.

[0056] Understandably, the upper oblique cut 220 is set at an angle relative to the horizontal line, which increases the area of ​​the first outlet 202, increases the contact area between the airflow and the high-speed airflow zone 103, accelerates the flow of airflow in the guide tube to the high-speed airflow zone 103, and optimizes the diversion efficiency.

[0057] In this embodiment, the guide member 200 rotates relative to the first direction Z so that the first inlet 201 is connected to the low-speed vortex region 104 and the first outlet 202 is connected to the high-speed airflow region 103.

[0058] It is understandable that when the airflow passes through the air outlet 100, the pressure difference guide 200 guides the airflow in the low-speed vortex region 104 to the air outlet 102 of the air outlet 100, thereby suppressing the expansion of the area of ​​the low-speed vortex region 104.

[0059] In an optional embodiment, please refer to Figure 2 Under the condition that the airflow passes through the first channel 101, the airflow forms an adjacent high-speed airflow zone 103 and a low-speed vortex zone 104 in the first channel 101; the guide member 200 rotates relative to the first direction Z so that the first inlet 201 is connected to the low-speed vortex zone 104 and the first outlet 202 is connected to the high-speed airflow zone 103.

[0060] Understandably, because the airflow velocity in the high-speed airflow zone 103 is high, and the first outlet 202 is connected to the high-speed airflow zone 103, sufficient negative pressure can be formed at the first outlet 202 of the guide member 200. However, the airflow velocity in the low-speed vortex zone 104 is low, and the first inlet 201 of the guide member 200 is connected to the low-speed vortex zone 104. The negative pressure capacity of the first outlet 202 is weak. Therefore, a positive pressure gradient is formed on the guide member 200 from the first inlet 201 to the first outlet 202. As a result, when the airflow passes through the air outlet duct 100, the pressure difference guide member 200 guides the airflow in the low-speed vortex zone 104 to the high-speed airflow zone 103 or the air outlet, thereby suppressing the expansion of the area of ​​the low-speed vortex zone 104. Furthermore, when airflows at different speeds pass through the first channel 101, the areas of the high-speed airflow region 103 and the low-speed vortex region 104 formed are different. Therefore, by setting a guide 200 that rotates relative to the first direction Z, an adaptive arrangement for airflows at different speeds can be achieved.

[0061] In this embodiment, please refer to Figures 2-4 The fan 010 also includes a drive assembly 300, which is connected to the air outlet pipe 100. The output end of the drive assembly 300 is connected to the flow guide 200. The drive assembly 300 is used to drive the flow guide 200 to rotate relative to the first direction Z.

[0062] In this embodiment, please refer to Figures 2-4 The drive assembly 300 includes a connecting part 310, a transmission assembly 320, and a drive member 330. The guide member 200 is connected to the connecting part 310 along the second direction Y. Both ends of the connecting part 310 are rotatably connected to the air outlet pipe 100. One end of the connecting part 310 passes through the body 120 of the air outlet pipe 100 and is drivenly connected to the transmission assembly 320. The drive member 330 is connected to the outer wall of the guide member 200, and the output end of the drive member 330 is drivenly connected to the transmission assembly 320. The drive member 330 is used to drive the connecting part 310 to rotate through the transmission assembly 320, so that the guide member 200 rotates relative to the first direction Z.

[0063] Optionally, the connecting part 310 is a rotating shaft.

[0064] Optionally, the drive unit 330 can be a motor, and the drive unit 330 can be fixed on the base 110.

[0065] Alternatively, please refer to Figures 2-4 The transmission assembly 320 includes a first transmission wheel 321, a transmission belt 322, and a second transmission wheel 323. The first transmission wheel 321 is fixed to one end of the connecting part 310. The output end of the driving member 330 is connected to the second transmission wheel 323. The transmission belt 322 is sleeved on the first transmission wheel 321 and the second transmission wheel 323.

[0066] The output end of the drive component 330 is provided with an output shaft 331, which is connected to drive the second transmission wheel 323.

[0067] It is understandable that the driving component 330 drives the second transmission wheel 323 to rotate, and the second transmission wheel 323 drives the first transmission wheel 321 to rotate through the transmission belt 322. The first transmission wheel 321 synchronously drives the connecting part 310 and the diverting component 200 to rotate relative to the first direction Z.

[0068] Of course, in other embodiments, the transmission assembly 320 may also engage with a third transmission wheel and a fourth transmission wheel, with the third transmission wheel fixed to one end of the connecting part 310 and the output end of the driving member 330 being connected to the fourth transmission wheel.

[0069] In this embodiment, the fan 010 also includes a volute 400.

[0070] In this embodiment, please refer to Figure 2 The volute 400 includes a spiral shell 410 and an air outlet 420 that are interconnected. The air outlet 420 has a third channel inside. The air outlet pipe 100 is connected to the air outlet 420. The first channel 101 and the third channel are connected. The low-speed vortex region 104 is located on the side close to the spiral shell 410, and the high-speed airflow region 103 is located on the side away from the spiral shell 410.

[0071] The spiral shell 410 is provided with a second inlet 411, the air outlet 420 is provided with a second outlet, the second outlet is connected to the air inlet, and the air outlet 420 is connected to the base 110 of the air outlet pipe 100 through a connector.

[0072] In this embodiment, please refer to Figures 2-4 The volute 400 also includes an impeller 430 and a power component disposed inside the spiral housing 410. The power component is connected to the impeller 430 in a transmission manner and is used to drive the impeller 430 to rotate. The blade assembly includes multiple blades that are fixedly connected to each other and are arranged in a circular pattern.

[0073] The spiral shell 410 and the air outlet 420 have a volute tongue structure on the side near the impeller 430.

[0074] Understandably, please refer to Figure 1 The power component drives the impeller 430 to rotate, and the rotation of the impeller 430 generates airflow. The airflow carries the oil fumes from the second inlet 411 into the first channel 101 of the exhaust pipe 100 and out through the second outlet. Among them, a part of the airflow generates vortex airflow at the connection between the volute 400 and the exhaust pipe 100.

[0075] In this embodiment, the range hood has multiple speed settings. Depending on the speed setting, the impeller 430 rotates at different speeds, and the airflow speed and flow rate driven by the impeller 430 are also different. Therefore, the areas of the adjacent high-speed airflow zone 103 and low-speed vortex zone 104 formed by the airflow in the first channel 101 are also different. Consequently, the guide member 200 rotates relative to the first direction Z so that the guide member 200 can effectively guide the airflow in the low-speed vortex zone 104.

[0076] The working principle and process of the fan 010 and range hood provided in this embodiment of the utility model are as follows:

[0077] When the range hood is working, the airflow in the volute 400 enters the air outlet 100 through the air inlet. The airflow passes through the first channel 101, and the airflow forms an adjacent high-speed airflow zone 103 and a low-speed vortex zone 104 in the first channel 101.

[0078] The driving component 330 drives the second transmission wheel 323 to rotate, and the second transmission wheel 323 drives the first transmission wheel 321 to rotate via the transmission belt 322. The first transmission wheel 321 synchronously drives the connecting part 310 and the guide component 200 to rotate relative to the first direction Z, so that the first inlet 201 of the guide component 200 is connected to the low-speed vortex zone 104, and the first outlet 202 is connected to the high-speed airflow zone 103 or the air outlet 102. At this time, due to the pressure difference, the guide component 200 guides the airflow of the low-speed vortex zone 104 to the high-speed airflow zone 103 or the air outlet 102.

[0079] In summary, the fan 010 and range hood provided in this embodiment of the present invention, by providing a guide member 200 in the air outlet duct 100, with one end of the guide member 200 extending to the connection point near the volute 400 and the air outlet duct 100, allows the guide member 200 to directly guide the vortex airflow generated at the connection point between the volute 400 and the air outlet duct 100 to the air outlet 102 of the air outlet duct 100 when the fan 010 is working. This suppresses the expansion of the low-speed vortex zone 104 area in the air outlet duct 100, increases the effective flow area at the air outlet 102, and improves the air volume of the range hood.

[0080] Furthermore, when airflows at different velocities pass through the outlet duct 100, the area of ​​the low-speed vortex zone 104 formed by them is different. Therefore, by setting a guide 200 that rotates relative to the first direction Z, an adaptive arrangement for airflows at different velocities can be achieved.

[0081] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A fan, comprising a volute (400) and an impeller (430) disposed within the volute (400), characterized in that: The volute (400) is connected to an air outlet pipe (100), the air outlet pipe (100) is provided with an air outlet (102), and a guide (200) is provided at the air outlet (102). One end of the guide (200) extends to the connection between the volute (400) and the air outlet pipe (100). When the fan (010) is working, a vortex airflow is generated at the connection between the volute (400) and the air outlet pipe (100), and the guide component (200) is used to guide the vortex airflow.

2. The fan according to claim 1, characterized in that, The flow guide (200) is a flow guide pipe, which has a lower oblique cut (210) with the oblique cut surface of the lower oblique cut (210) facing the low-speed vortex region (104) at the connection between the volute (400) and the air outlet pipe (100).

3. The fan according to claim 1, characterized in that, The flow guide (200) is a flow guide tube, which has an upper oblique cut (220) with the oblique cut surface facing the high-speed airflow area (103) at the connection between the volute (400) and the air outlet pipe (100).

4. The fan according to claim 1, characterized in that, The drainage component (200) is a drainage tube, which includes at least a straight tube structure with a circular outer wall or a straight tube structure with an arc-shaped outer wall.

5. The fan according to claim 1, characterized in that, The diversion component (200) is a diversion tube, which has a second channel that passes through it. The second channel diverts the vortex airflow. The lower end of the diversion tube has a first inlet (201) that communicates with the second channel, and the upper end of the diversion tube has a first outlet (202) that communicates with the second channel.

6. The fan according to claim 1, characterized in that, The draining element (200) is rotatably positioned relative to the first direction (Z).

7. The fan according to claim 6, characterized in that, The fan (010) further includes a drive assembly (300), which is connected to the air outlet pipe (100). The output end of the drive assembly (300) is connected to the guide member (200) in a transmission connection. The drive assembly (300) is used to drive the guide member (200) to rotate relative to the first direction (Z).

8. The fan according to claim 7, characterized in that, The drive assembly (300) includes a connecting part (310), a transmission assembly (320), and a drive member (330); the guide member (200) is connected to the connecting part (310) along a second direction (Y), both ends of the connecting part (310) are rotatably connected to the air outlet pipe (100), one end of the connecting part (310) passes through the air outlet pipe (100) and is drively connected to the transmission assembly (320); the drive member (330) is connected to the outer wall of the guide member (200), and the output end of the drive member (330) is drively connected to the transmission assembly (320); The drive member (330) is used to drive the connecting part (310) to rotate via the transmission assembly (320) so that the drain member (200) rotates relative to the first direction (Z); The first direction (Z) and the second direction (Y) are set perpendicularly.

9. The fan according to claim 8, characterized in that, The transmission assembly (320) includes a first transmission wheel (321), a transmission belt (322), and a second transmission wheel (323). The first transmission wheel (321) is fixed to one end of the connecting part (310). The output end of the driving member (330) is connected to the second transmission wheel (323) for transmission. The transmission belt (322) is sleeved on the first transmission wheel (321) and the second transmission wheel (323).

10. A range hood, characterized in that, Includes the fan (010) as described in any one of claims 1-9.

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